I've got a component that downloads data from an API. When the user clicks Search, the content from the API is fetched via AJAX. This content from the API is in JSON and has got an ID of the product inside. I am able to create new HTML elements based on this content and put them inside my site, but I would like every created on the fly element to have routerLink="/detailsPage/itemID" working, so that after clicking it would route to detailsPage with apropriate ID. How to do it in the most simple way? I assume some recompiling of refreshing is needed.
The answer to this question is HTTPClient - Angular offers it as an easier way to use XMLHttpRequest (AJAX) in Angular applications, and using it also makes sure that routerLink or any other Angular directives will work on objects created dynamically with this method.
Angular - HTTPClient
Related
I know that the webpage that is opened by the user is part of the view. This one is easy, but what about js code calling the server to retrieve data via ajax? Is this part of the controller or still the view?
Can the view request data like this?
Thank you very much for any help.
Javascript, including Ajax, is a client-side technology. Therefore, in the context of MVC, any js script must be part of a template file.
Note that a template file is not the view (the V in MVC), but a part of it. The view should incorporate both server-side components (classes, interfaces, etc) and client-side components (html, js, css, images, etc). For example, an instance of a view class could read some data from the domain model and then load and render a certain template file, injecting the fetched data into it (formatted), in order to be printed on the screen.
So, an ajax object should be defined in a template file. Its request to the server is handled either by the controller, or by the server-side components of the view, depending on the MVC approach that you are choosing to implement. Though, the server response should always be created by the server-side components of the view.
I was learning about Spring REST HATEOAS. But, I am confused about how we use it on the client end..
I mean, let's say I want write a client app using Angular JS. So now I don't have to hardcode the URL's to make REST API calls? And instead i'd use the "rel" attribute that gets returned?
for example, from angular JS,
I'd use the root URL "/products"
It returns links to individual products (Which I believe will be populated on UI)
User selects a product and angular will fetch the product details, along with relevant links to that product to delete, edit, etc..
If user clicks on delete, Angualar will use the URI specified in "rel=delete" to delete that product..
Is my understanding correct?
Is there a sample angular code, that doesn't hardcode URI but use the rel attribute?
I am trying to merge surveyjs along with my NativeScript application. I have referred URL for merging the same with Angular application
From the Angular demo code given on website, we have to add event handler for Complete button where we can get the response from surveyjs. Is it possible to integrate similarly for Nativescript Mobile application? Here is the approach which i feel can be taken.
Display
Create a HTML as provided by SurveyJS with required CSS and JS
referenced and add them as a file in project.
Modify HTML once i get the survey question json back from server.
Show the HTML as part of WebView. This will take care of displaying
the survey on my Application.
Here are my challenges during Submission
As per the process given on SurveyJS, i need to add handler for
oncomplete which will get the result json for me. How can i add
handlers for Complete button click in my code? Also please note that
there is a possibility that there may be multiple surveys on a single
page.
Apart from Survey, there are other fields also on the page and user
will submit them all in one go by clicking submit button of the page.
Hence i am planning to hide Complete button provided by SurveyJS
page. This needs to be triggered via code. Can this be done?
If someone can give directions on whether this scenario can be handled in nativescript application with Angular,it would help immensely.
yes it can be done using nativescript-webview-interface plugin.
add jS code inside WebView to handle oncomplete event from surveyJS. and on that function call emit some event to native app. after that add nativescript code to listen for that event and get the JSON back.
inside webView JS function
var oWebViewInterface = window.nsWebViewInterface;
// emit event to native app
oWebViewInterface.emit('anyEvent', jsonData);
inside native App
oWebViewInterface.on('anyEvent', function(jsonData){
// perform action on event
});
for more details on this you can check plugin readme file https://github.com/shripalsoni04/nativescript-webview-interface
I am a complete newbie to AngularJS. I want to check the feasibility of using it in my new Project which is a web application. I already have a few pages created in project using Struts2 Spring and hibernate. To convert these following are points I understand:
Convert server side API to REST style which returns JSON data
Question: Can I use dynamic HTML to load using AngularJS. I guess yes. not sure how?
Currently I use velocity Templates on server side to populate data in HTML templates and send it as response in AJAX? What would change if i try to use AngularJS?
I have a landing page which is used to show some images and data associated with it which is stored in DB. How can I show it using AngularJS?
Question: Shall I load the HTML template which contains only one div tag when I hit website URL(mysite.com) and then fire AJAX requests to load the dynamic HTML?
If I use AndularJS does it invalidate use of Struts2 altogether if I choose to implement my Data API as REST with JSON? I guess not as I will still need to load dynamic HTML views which will be generated on Server correct?
How to maintain HTTP session state on server side if I use REST data API with AngularJS on client?
I know I can search and read about answers to above questions on net somewhere. I just need them at one place so that I can carry discussion and other questions that arise from it.
I may answer some of your questions:
1) Convert server side API to REST style which returns JSON data
Yes
Question : Can I use dynamic HTML to load using AngularJS. I guess
yes. not sure how?
Currently I use velocity Templates on server side to populate data in HTML templates and send it as response in AJAX? What would change
if i try to use AngularJS?
If I understood you right, you want to generate templates on server-side. In this case - you just don't need AngularJs - your views are prepopulated on server and browser recieves static content (from client-side point of view). If you want to use AngularJs, then your templates will become static content (from server-side point of view) and they will be populated by angular via REST services.
2) I have a landing page which is used to show some images and data
associated with it which is stored in DB. How can I show it using
AngularJS?
Question : Shall I load the HTML template which contains
only one div tag when I hit website URL(mysite.com) and then fire AJAX
requests to load the dynamic HTML?
Not exactly. One div would be enough for jQuery-based approuch (you would use something like $.ajax and then appended data in imperative way). In case of Angular you will need to return template. It may look like this:
<ul ng-controller="MyCtrl">
<li ng-repeat="item in data">
<img ng-src="item.image.src">
<span>{{item.data.someTextProperty}}</span>
</li>
</ul>
And some AngularJs controller that will fire request to REST service (via your AngularJs service, probably) and autmatically fill template with results
function MyCtrl($scope, $http) {
$http.get('/rest/data').success(function(result) {
$scope.data = result;
});
}
3) If I use AndularJS does it invalidate use of Struts2 altogether if
I choose to implement my Data API as REST with JSON? I guess not as I
will still need to load dynamic HTML views which will be generated on
Server correct?
I think it will only invalidate use of View of MVC in Struts, since AngularJS will just replace it. Also it will make you to use something like RESTful controllers (not quite familliar with Struts, but I think there is something like this)
4) How to maintain HTTP session state on server side if I use REST
data API with AngularJS on client?
This is not short answer, but basically there is following pattern. AngualrJs provides http interceptors, that may intercept requests and responses. If response with code 401 (which is unauthorized) is intercepted, you may provide your user with a login form to restore session and after this action will be completed, retry last request. Also, here you may find another aspect of this question.
I hope my answer helped you.
Greeting to the community. This is my very first question.
I had in mind to add Livezilla live support in my MVC website, but I realised that there are some problems.
First of all, it is written in php and mysql, so is it possible to comply with MVC and sql server?
Does anybody know a similar solution (like livezilla) in my case?
PS. Excuse my poor english...
you could even look into using an iFrame to run livezilla inside of an mvc3 page if you wanted.
or, you could roll your own. if you wanted to try implementing a live response mvc3 page look into jquery and ajax asynchronous calls such as $.post and also look into the extension for controller AsyncController, and [AsyncTimeout(XXX)]. you will also have to read up on sending and receiving json objects in ajax and from a controller to the view.
Simple psuedo:
View:
setTimeOut calls a javascript function every X milliseconds
the javascript function uses json to wrap page data and pass it to the controller inside a $.post() call
Controller:
recieves page data as an model object in a post
determines if page is out of sync or not
returns relevant sync data in a json object back to the view
View:
the same javascript function receives the json object from controller
updates the page based on relevant sync data
Problem solved. I just uploaded the folder given from livezilla in the root folder of my website. Then the only need to met is to have a Mysql server to create the database for livezilla. After that php and mvc runs together with no problem.